I have stock AP2 with a Skunk2 Dual exhaust. What would be the best aftermarket catalytic converter time purchase.

 

EVS or HKS, you just have to match the piping of your exhaust. EVS is cheaper and will flow better/more exhaust smell, HKS costs a lot more and will flow worse/have less exhaust smell.

 

my berk highflow worked great until I pulled it in favor of going catless. threw no cel and added a nice raspyness to the exhaust tone

 

I have a berk 70mm with my 70mm single exhaust. Never smelled anything once.

 

I have a 63mm berk hfc and smell the exhaust every time I back car out of the garage. But then I never smell it any other time.

I believe two factors are at play:

1. Chemical reactions prefers heat. When cold, the catalyst doesn't work as well.

2. Backing up results in passing through the noxious airborne substances you just created.

There was never any smell previously with oem cat in the years I spent backing the cold car out of the garage on a daily basis.

The fact that you don't smell exhaust from your hfc doesn't prove its not creating any odor, just that you rarely pass through it.